H90 MESSRS. B.C. A. WIM)J,1. ANH p. G. PARSONS OM Dec 17. 



Origin. Insertion. 



Horse (58) Glenoid. Radius. 



Rhinoceros (63) Radius and fascia. 



Rhinoceros (66) Coracoid. Radius. 



Hrrax (67) Glenoid. Ulna. 



Hyrax (68) « Glenoid. Ulna. 



Hyrax (71) Ulna. 



Elephant (74) Glenoid. Ulna. 



Elephant (77) ........ Glenoid. Ulna. 



Elephant (78) Glenoid. 



Elephant (70) Glenoid and small Radius and ulna. 



coracoid. 



In the Camel (18) and the Brocket Deer (28) the tendon of 

 origin was thick at the margins and very thin in the centre, giving 

 the appearance of a fusion of two tendons. It has been suggested 

 that this points to the conclusion that the long and short heads 

 have fused together instead of the short one disappearing. Until 

 some intermediate stages are found we think that this should 

 remain a mere suggestion, in the Water-Chcvrotnin (23) Chatin 

 notices some tendinous intersections in the muscle, but we have 

 not seen them in any other animal. 



The nerve-supply is from a branch of the external head of the 

 median, which corresponds to the musculocutaneous of human 

 anatomy. 



Coraco-brachialis. — Various authors stale that the first, second, 

 or third parts of this muscle are present, but it is very difficult to 

 be sure what they mean by it. Our own experience makes us 

 insist very strongly that the position of the musculocutaneous 

 nerve does not necessarily mark out the division between any 

 two parts of the muscle. The first part is the coraco-brachialis 

 brevis or rotator humeri, and is always inserted into the neck of 

 the humerus above the tendon of the latissimus dorsi. The second 

 part is inserted into the middle of the shaft, and passes ventral to 

 the latissimus dorsi. It is true that in most Mammals the nerve 

 passes above this part, that is, between it and the brevis ; but, as 

 we shall see, it is not at all uncommon for the nerve to sink into 

 the coraco-brachialis medius in the same way that the whole or 

 part of the great sciatic nerve occasionally perforates the pyri- 

 formis. Between the second and third parts (medius and longus) 

 there is no definite demarcation : whenever the muscle reaches 

 the lower extremity of the humerus, it is usual to say that a 

 coraco-brachialis longus is present. 



It is greatly to be desired that anatomists in the future should 

 record in connection with this muscle not only the amount of 

 the humerus to which it is attached, but also its relation to the 

 latissimus dorsi tendon and to the musculocutaneous nerve. 



In the Hippopotamus, Alix and Gratiolet (III.) say that the 

 longus alone is present; but in Cuvier and Laurillard's plate (I.) 

 there are no signs of any part of the muscle. 



